aboutsummaryrefslogtreecommitdiff
path: root/src/Text/Pandoc/Writers/Docx.hs
blob: 2caba59cccf8fbe106888a1bee198fa68a4c0837 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
{-# LANGUAGE PatternGuards       #-}
{-# LANGUAGE RankNTypes          #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE ViewPatterns        #-}
{-# LANGUAGE FlexibleContexts    #-}
{-# LANGUAGE OverloadedStrings   #-}
{- |
   Module      : Text.Pandoc.Writers.Docx
   Copyright   : Copyright (C) 2012-2020 John MacFarlane
   License     : GNU GPL, version 2 or above

   Maintainer  : John MacFarlane <jgm@berkeley.edu>
   Stability   : alpha
   Portability : portable

Conversion of 'Pandoc' documents to docx.
-}
module Text.Pandoc.Writers.Docx ( writeDocx ) where
import Codec.Archive.Zip
import Control.Applicative ((<|>))
import Control.Monad.Except (catchError, throwError)
import Control.Monad.Reader
import Control.Monad.State.Strict
import qualified Data.ByteString as B
import qualified Data.ByteString.Lazy as BL
import Data.Char (isSpace, isLetter)
import Data.List (intercalate, isPrefixOf, isSuffixOf)
import Data.String (fromString)
import qualified Data.Map as M
import Data.Maybe (fromMaybe, isNothing, mapMaybe, maybeToList)
import qualified Data.Set as Set
import qualified Data.Text as T
import qualified Data.Text.Lazy as TL
import Data.Time.Clock.POSIX
import Data.Digest.Pure.SHA (sha1, showDigest)
import Skylighting
import System.Random (randomRs, mkStdGen)
import Text.Pandoc.BCP47 (getLang, renderLang)
import Text.Pandoc.Class.PandocMonad (PandocMonad, report, toLang)
import qualified Text.Pandoc.Class.PandocMonad as P
import Data.Time
import Text.Pandoc.UTF8 (fromTextLazy)
import Text.Pandoc.Definition
import Text.Pandoc.Generic
import Text.Pandoc.Highlighting (highlight)
import Text.Pandoc.Error
import Text.Pandoc.ImageSize
import Text.Pandoc.Logging
import Text.Pandoc.MIME (MimeType, extensionFromMimeType, getMimeType,
                         getMimeTypeDef)
import Text.Pandoc.Options
import Text.Pandoc.Writers.Docx.StyleMap
import Text.Pandoc.Shared
import Text.Pandoc.Walk
import Text.Pandoc.Writers.Math
import Text.Pandoc.Writers.Shared
import Text.Printf (printf)
import Text.TeXMath
import Text.XML.Light as XML
import Text.XML.Light.Cursor as XMLC
import Text.Pandoc.Writers.OOXML

data ListMarker = NoMarker
                | BulletMarker
                | NumberMarker ListNumberStyle ListNumberDelim Int
                deriving (Show, Read, Eq, Ord)

listMarkerToId :: ListMarker -> String
listMarkerToId NoMarker = "990"
listMarkerToId BulletMarker = "991"
listMarkerToId (NumberMarker sty delim n) =
  '9' : '9' : styNum : delimNum : show n
  where styNum = case sty of
                      DefaultStyle -> '2'
                      Example      -> '3'
                      Decimal      -> '4'
                      LowerRoman   -> '5'
                      UpperRoman   -> '6'
                      LowerAlpha   -> '7'
                      UpperAlpha   -> '8'
        delimNum = case delim of
                      DefaultDelim -> '0'
                      Period       -> '1'
                      OneParen     -> '2'
                      TwoParens    -> '3'

data EnvProps = EnvProps{ styleElement  :: Maybe Element
                        , otherElements :: [Element]
                        }

instance Semigroup EnvProps where
  EnvProps s es <> EnvProps s' es' = EnvProps (s <|> s') (es ++ es')

instance Monoid EnvProps where
  mempty = EnvProps Nothing []
  mappend = (<>)

squashProps :: EnvProps -> [Element]
squashProps (EnvProps Nothing es) = es
squashProps (EnvProps (Just e) es) = e : es

data WriterEnv = WriterEnv{ envTextProperties :: EnvProps
                          , envParaProperties :: EnvProps
                          , envRTL            :: Bool
                          , envListLevel      :: Int
                          , envListNumId      :: Int
                          , envInDel          :: Bool
                          , envChangesAuthor  :: T.Text
                          , envChangesDate    :: T.Text
                          , envPrintWidth     :: Integer
                          }

defaultWriterEnv :: WriterEnv
defaultWriterEnv = WriterEnv{ envTextProperties = mempty
                            , envParaProperties = mempty
                            , envRTL = False
                            , envListLevel = -1
                            , envListNumId = 1
                            , envInDel = False
                            , envChangesAuthor  = "unknown"
                            , envChangesDate    = "1969-12-31T19:00:00Z"
                            , envPrintWidth     = 1
                            }

data WriterState = WriterState{
         stFootnotes      :: [Element]
       , stComments       :: [([(T.Text, T.Text)], [Inline])]
       , stSectionIds     :: Set.Set T.Text
       , stExternalLinks  :: M.Map String String
       , stImages         :: M.Map FilePath (String, String, Maybe MimeType, B.ByteString)
       , stLists          :: [ListMarker]
       , stInsId          :: Int
       , stDelId          :: Int
       , stStyleMaps      :: StyleMaps
       , stFirstPara      :: Bool
       , stInTable        :: Bool
       , stInList         :: Bool
       , stTocTitle       :: [Inline]
       , stDynamicParaProps :: Set.Set ParaStyleName
       , stDynamicTextProps :: Set.Set CharStyleName
       , stCurId          :: Int
       }

defaultWriterState :: WriterState
defaultWriterState = WriterState{
        stFootnotes      = defaultFootnotes
      , stComments       = []
      , stSectionIds     = Set.empty
      , stExternalLinks  = M.empty
      , stImages         = M.empty
      , stLists          = [NoMarker]
      , stInsId          = 1
      , stDelId          = 1
      , stStyleMaps      = StyleMaps M.empty M.empty
      , stFirstPara      = False
      , stInTable        = False
      , stInList         = False
      , stTocTitle       = [Str "Table of Contents"]
      , stDynamicParaProps = Set.empty
      , stDynamicTextProps = Set.empty
      , stCurId          = 20
      }

type WS m = ReaderT WriterEnv (StateT WriterState m)

renumIdMap :: Int -> [Element] -> M.Map String String
renumIdMap _ [] = M.empty
renumIdMap n (e:es)
  | Just oldId <- findAttr (QName "Id" Nothing Nothing) e =
      M.insert oldId ("rId" ++ show n) (renumIdMap (n+1) es)
  | otherwise = renumIdMap n es

replaceAttr :: (QName -> Bool) -> String -> [XML.Attr] -> [XML.Attr]
replaceAttr f val = map $
    \a -> if f (attrKey a) then XML.Attr (attrKey a) val else a

renumId :: (QName -> Bool) -> M.Map String String -> Element -> Element
renumId f renumMap e
  | Just oldId <- findAttrBy f e
  , Just newId <- M.lookup oldId renumMap =
    let attrs' = replaceAttr f newId (elAttribs e)
    in
     e { elAttribs = attrs' }
  | otherwise = e

renumIds :: (QName -> Bool) -> M.Map String String -> [Element] -> [Element]
renumIds f renumMap = map (renumId f renumMap)

findAttrTextBy :: (QName -> Bool) -> Element -> Maybe T.Text
findAttrTextBy x = fmap T.pack . findAttrBy x

lookupAttrTextBy :: (QName -> Bool) -> [XML.Attr] -> Maybe T.Text
lookupAttrTextBy x = fmap T.pack . lookupAttrBy x

-- | Certain characters are invalid in XML even if escaped.
-- See #1992
stripInvalidChars :: T.Text -> T.Text
stripInvalidChars = T.filter isValidChar

-- | See XML reference
isValidChar :: Char -> Bool
isValidChar '\t' = True
isValidChar '\n' = True
isValidChar '\r' = True
isValidChar '\xFFFE' = False
isValidChar '\xFFFF' = False
isValidChar c = (' ' <= c && c <= '\xD7FF') || ('\xE000' <= c)

writeDocx :: (PandocMonad m)
          => WriterOptions  -- ^ Writer options
          -> Pandoc         -- ^ Document to convert
          -> m BL.ByteString
writeDocx opts doc@(Pandoc meta _) = do
  let doc' = walk fixDisplayMath doc
  username <- P.lookupEnv "USERNAME"
  utctime <- P.getCurrentTime
  oldUserDataDir <- P.getUserDataDir
  P.setUserDataDir Nothing
  res <- P.readDefaultDataFile "reference.docx"
  P.setUserDataDir oldUserDataDir
  let distArchive = toArchive $ BL.fromStrict res
  refArchive <- case writerReferenceDoc opts of
                     Just f  -> toArchive <$> P.readFileLazy f
                     Nothing -> toArchive . BL.fromStrict <$>
                        P.readDataFile "reference.docx"

  parsedDoc <- parseXml refArchive distArchive "word/document.xml"
  let wname f qn = qPrefix qn == Just "w" && f (qName qn)
  let mbsectpr = filterElementName (wname (=="sectPr")) parsedDoc

  -- Gets the template size
  let mbpgsz = mbsectpr >>= filterElementName (wname (=="pgSz"))
  let mbAttrSzWidth = mbpgsz >>= lookupAttrTextBy ((=="w") . qName) . elAttribs

  let mbpgmar = mbsectpr >>= filterElementName (wname (=="pgMar"))
  let mbAttrMarLeft = mbpgmar >>= lookupAttrTextBy ((=="left") . qName) . elAttribs
  let mbAttrMarRight = mbpgmar >>= lookupAttrTextBy ((=="right") . qName) . elAttribs

  -- Get the available area (converting the size and the margins to int and
  -- doing the difference
  let pgContentWidth = do
                         w <- mbAttrSzWidth >>= safeRead
                         r <- mbAttrMarRight >>= safeRead
                         l <- mbAttrMarLeft >>= safeRead
                         pure $ w - r - l

  -- styles
  mblang <- toLang $ getLang opts meta
  let addLang :: Element -> Element
      addLang e = case (\l -> XMLC.toTree . go (T.unpack $ renderLang l) $
                                 XMLC.fromElement e) <$> mblang of
                    Just (Elem e') -> e'
                    _              -> e -- return original
        where go :: String -> Cursor -> Cursor
              go l cursor = case XMLC.findRec (isLangElt . current) cursor of
                              Nothing -> cursor
                              Just t  -> XMLC.modifyContent (setval l) t
              setval :: String -> Content -> Content
              setval l (Elem e') = Elem $ e'{ elAttribs = map (setvalattr l) $
                                               elAttribs e' }
              setval _ x         = x
              setvalattr :: String -> XML.Attr -> XML.Attr
              setvalattr l (XML.Attr qn@(QName "val" _ _) _) = XML.Attr qn l
              setvalattr _ x                                 = x
              isLangElt (Elem e') = qName (elName e') == "lang"
              isLangElt _         = False

  let stylepath = "word/styles.xml"
  styledoc <- addLang <$> parseXml refArchive distArchive stylepath

  -- parse styledoc for heading styles
  let styleMaps = getStyleMaps refArchive

  let tocTitle = case lookupMetaInlines "toc-title" meta of
                   [] -> stTocTitle defaultWriterState
                   ls -> ls

  let initialSt = defaultWriterState {
          stStyleMaps  = styleMaps
        , stTocTitle   = tocTitle
        }

  let isRTLmeta = case lookupMeta "dir" meta of
        Just (MetaString "rtl")        -> True
        Just (MetaInlines [Str "rtl"]) -> True
        _                              -> False

  let env = defaultWriterEnv {
          envRTL = isRTLmeta
        , envChangesAuthor = fromMaybe "unknown" username
        , envChangesDate   = T.pack $ formatTime defaultTimeLocale "%FT%XZ" utctime
        , envPrintWidth = maybe 420 (`quot` 20) pgContentWidth
        }


  ((contents, footnotes, comments), st) <- runStateT
                         (runReaderT
                          (writeOpenXML opts{writerWrapText = WrapNone} doc')
                          env)
                         initialSt
  let epochtime = floor $ utcTimeToPOSIXSeconds utctime
  let imgs = M.elems $ stImages st

  -- create entries for images in word/media/...
  let toImageEntry (_,path,_,img) = toEntry ("word/" ++ path) epochtime $ toLazy img
  let imageEntries = map toImageEntry imgs

  let stdAttributes =
            [("xmlns:w","http://schemas.openxmlformats.org/wordprocessingml/2006/main")
            ,("xmlns:m","http://schemas.openxmlformats.org/officeDocument/2006/math")
            ,("xmlns:r","http://schemas.openxmlformats.org/officeDocument/2006/relationships")
            ,("xmlns:o","urn:schemas-microsoft-com:office:office")
            ,("xmlns:v","urn:schemas-microsoft-com:vml")
            ,("xmlns:w10","urn:schemas-microsoft-com:office:word")
            ,("xmlns:a","http://schemas.openxmlformats.org/drawingml/2006/main")
            ,("xmlns:pic","http://schemas.openxmlformats.org/drawingml/2006/picture")
            ,("xmlns:wp","http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing")]


  parsedRels <- parseXml refArchive distArchive "word/_rels/document.xml.rels"
  let isHeaderNode e = findAttr (QName "Type" Nothing Nothing) e == Just "http://schemas.openxmlformats.org/officeDocument/2006/relationships/header"
  let isFooterNode e = findAttr (QName "Type" Nothing Nothing) e == Just "http://schemas.openxmlformats.org/officeDocument/2006/relationships/footer"
  let headers = filterElements isHeaderNode parsedRels
  let footers = filterElements isFooterNode parsedRels

  let extractTarget = findAttr (QName "Target" Nothing Nothing)

  -- we create [Content_Types].xml and word/_rels/document.xml.rels
  -- from scratch rather than reading from reference.docx,
  -- because Word sometimes changes these files when a reference.docx is modified,
  -- e.g. deleting the reference to footnotes.xml or removing default entries
  -- for image content types.

  -- [Content_Types].xml
  let mkOverrideNode (part', contentType') = mknode "Override"
               [("PartName",part'),("ContentType",contentType')] ()
  let mkImageOverride (_, imgpath, mbMimeType, _) =
          mkOverrideNode ("/word/" ++ imgpath,
                          maybe "application/octet-stream" T.unpack mbMimeType)
  let mkMediaOverride imgpath =
          mkOverrideNode ('/':imgpath, T.unpack $ getMimeTypeDef imgpath)
  let overrides = map mkOverrideNode (
                  [("/word/webSettings.xml",
                    "application/vnd.openxmlformats-officedocument.wordprocessingml.webSettings+xml")
                  ,("/word/numbering.xml",
                    "application/vnd.openxmlformats-officedocument.wordprocessingml.numbering+xml")
                  ,("/word/settings.xml",
                    "application/vnd.openxmlformats-officedocument.wordprocessingml.settings+xml")
                  ,("/word/theme/theme1.xml",
                    "application/vnd.openxmlformats-officedocument.theme+xml")
                  ,("/word/fontTable.xml",
                    "application/vnd.openxmlformats-officedocument.wordprocessingml.fontTable+xml")
                  ,("/docProps/app.xml",
                    "application/vnd.openxmlformats-officedocument.extended-properties+xml")
                  ,("/docProps/core.xml",
                    "application/vnd.openxmlformats-package.core-properties+xml")
                  ,("/docProps/custom.xml",
                    "application/vnd.openxmlformats-officedocument.custom-properties+xml")
                  ,("/word/styles.xml",
                    "application/vnd.openxmlformats-officedocument.wordprocessingml.styles+xml")
                  ,("/word/document.xml",
                    "application/vnd.openxmlformats-officedocument.wordprocessingml.document.main+xml")
                  ,("/word/comments.xml",
                    "application/vnd.openxmlformats-officedocument.wordprocessingml.comments+xml")
                  ,("/word/footnotes.xml",
                    "application/vnd.openxmlformats-officedocument.wordprocessingml.footnotes+xml")
                  ] ++
                  map (\x -> (maybe "" ("/word/" ++) $ extractTarget x,
                       "application/vnd.openxmlformats-officedocument.wordprocessingml.header+xml")) headers ++
                  map (\x -> (maybe "" ("/word/" ++) $ extractTarget x,
                       "application/vnd.openxmlformats-officedocument.wordprocessingml.footer+xml")) footers) ++
                    map mkImageOverride imgs ++
                    [ mkMediaOverride (eRelativePath e) | e <- zEntries refArchive
                                        , "word/media/" `isPrefixOf` eRelativePath e ]

  let defaultnodes = [mknode "Default"
              [("Extension","xml"),("ContentType","application/xml")] (),
             mknode "Default"
              [("Extension","rels"),("ContentType","application/vnd.openxmlformats-package.relationships+xml")] ()]
  let contentTypesDoc = mknode "Types" [("xmlns","http://schemas.openxmlformats.org/package/2006/content-types")] $ defaultnodes ++ overrides
  let contentTypesEntry = toEntry "[Content_Types].xml" epochtime
        $ renderXml contentTypesDoc

  -- word/_rels/document.xml.rels
  let toBaseRel (url', id', target') = mknode "Relationship"
                                          [("Type",url')
                                          ,("Id",id')
                                          ,("Target",target')] ()
  let baserels' = map toBaseRel
                    [("http://schemas.openxmlformats.org/officeDocument/2006/relationships/numbering",
                      "rId1",
                      "numbering.xml")
                    ,("http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles",
                      "rId2",
                      "styles.xml")
                    ,("http://schemas.openxmlformats.org/officeDocument/2006/relationships/settings",
                      "rId3",
                      "settings.xml")
                    ,("http://schemas.openxmlformats.org/officeDocument/2006/relationships/webSettings",
                      "rId4",
                      "webSettings.xml")
                    ,("http://schemas.openxmlformats.org/officeDocument/2006/relationships/fontTable",
                      "rId5",
                      "fontTable.xml")
                    ,("http://schemas.openxmlformats.org/officeDocument/2006/relationships/theme",
                      "rId6",
                      "theme/theme1.xml")
                    ,("http://schemas.openxmlformats.org/officeDocument/2006/relationships/footnotes",
                      "rId7",
                      "footnotes.xml")
                    ,("http://schemas.openxmlformats.org/officeDocument/2006/relationships/comments",
                      "rId8",
                      "comments.xml")
                    ]

  let idMap = renumIdMap (length baserels' + 1) (headers ++ footers)
  let renumHeaders = renumIds (\q -> qName q == "Id") idMap headers
  let renumFooters = renumIds (\q -> qName q == "Id") idMap footers
  let baserels = baserels' ++ renumHeaders ++ renumFooters
  let toImgRel (ident,path,_,_) =  mknode "Relationship" [("Type","http://schemas.openxmlformats.org/officeDocument/2006/relationships/image"),("Id",ident),("Target",path)] ()
  let imgrels = map toImgRel imgs
  let toLinkRel (src,ident) =  mknode "Relationship" [("Type","http://schemas.openxmlformats.org/officeDocument/2006/relationships/hyperlink"),("Id",ident),("Target",src),("TargetMode","External") ] ()
  let linkrels = map toLinkRel $ M.toList $ stExternalLinks st
  let reldoc = mknode "Relationships" [("xmlns","http://schemas.openxmlformats.org/package/2006/relationships")] $ baserels ++ imgrels ++ linkrels
  let relEntry = toEntry "word/_rels/document.xml.rels" epochtime
        $ renderXml reldoc


  -- adjust contents to add sectPr from reference.docx
  let sectpr = case mbsectpr of
        Just sectpr' -> let cs = renumIds
                                 (\q -> qName q == "id" && qPrefix q == Just "r")
                                 idMap
                                 (elChildren sectpr')
                        in
                         add_attrs (elAttribs sectpr') $ mknode "w:sectPr" [] cs
        Nothing      -> mknode "w:sectPr" [] ()

  -- let sectpr = fromMaybe (mknode "w:sectPr" [] ()) mbsectpr'
  let contents' = contents ++ [sectpr]
  let docContents = mknode "w:document" stdAttributes
                    $ mknode "w:body" [] contents'



  -- word/document.xml
  let contentEntry = toEntry "word/document.xml" epochtime
                     $ renderXml docContents

  -- footnotes
  let notes = mknode "w:footnotes" stdAttributes footnotes
  let footnotesEntry = toEntry "word/footnotes.xml" epochtime $ renderXml notes

  -- footnote rels
  let footnoteRelEntry = toEntry "word/_rels/footnotes.xml.rels" epochtime
        $ renderXml $ mknode "Relationships" [("xmlns","http://schemas.openxmlformats.org/package/2006/relationships")]
        linkrels

  -- comments
  let commentsEntry = toEntry "word/comments.xml" epochtime
        $ renderXml $ mknode "w:comments" stdAttributes comments

  -- styles

  -- We only want to inject paragraph and text properties that
  -- are not already in the style map. Note that keys in the stylemap
  -- are normalized as lowercase.
  let newDynamicParaProps = filter
        (\sty -> not $ hasStyleName sty $ smParaStyle styleMaps)
        (Set.toList $ stDynamicParaProps st)

      newDynamicTextProps = filter
        (\sty -> not $ hasStyleName sty $ smCharStyle styleMaps)
        (Set.toList $ stDynamicTextProps st)

  let newstyles = map newParaPropToOpenXml newDynamicParaProps ++
                  map newTextPropToOpenXml newDynamicTextProps ++
                  maybe [] (styleToOpenXml styleMaps) (writerHighlightStyle opts)
  let styledoc' = styledoc{ elContent = elContent styledoc ++
                                           map Elem newstyles }
  let styleEntry = toEntry stylepath epochtime $ renderXml styledoc'

  -- construct word/numbering.xml
  let numpath = "word/numbering.xml"
  numbering <- parseXml refArchive distArchive numpath
  let newNumElts = mkNumbering (stLists st)
  let pandocAdded e =
       case findAttrTextBy ((== "abstractNumId") . qName) e >>= safeRead of
         Just numid -> numid >= (990 :: Int)
         Nothing    ->
           case findAttrTextBy ((== "numId") . qName) e >>= safeRead of
             Just numid -> numid >= (1000 :: Int)
             Nothing    -> False
  let oldElts = filter (not . pandocAdded) $ onlyElems (elContent numbering)
  let allElts = oldElts ++ newNumElts
  let numEntry = toEntry numpath epochtime $ renderXml numbering{ elContent =
                       -- we want all the abstractNums first, then the nums,
                       -- otherwise things break:
                       [Elem e | e <- allElts
                               , qName (elName e) == "abstractNum" ] ++
                       [Elem e | e <- allElts
                               , qName (elName e) == "num" ] }

  let keywords = case lookupMeta "keywords" meta of
                       Just (MetaList xs) -> map stringify xs
                       _                  -> []

  -- docProps/core.xml
  let docPropsPath = "docProps/core.xml"
  let extraCoreProps = ["subject","lang","category","description"]
  let extraCorePropsMap = M.fromList $ zip extraCoreProps
                       ["dc:subject","dc:language","cp:category","dc:description"]
  let lookupMetaString' :: T.Text -> Meta -> T.Text
      lookupMetaString' key' meta' =
        case key' of
             "description"    -> T.intercalate "_x000d_\n" (map stringify $ lookupMetaBlocks "description" meta')
             key''            -> lookupMetaString key'' meta'

  let docProps = mknode "cp:coreProperties"
          [("xmlns:cp","http://schemas.openxmlformats.org/package/2006/metadata/core-properties")
          ,("xmlns:dc","http://purl.org/dc/elements/1.1/")
          ,("xmlns:dcterms","http://purl.org/dc/terms/")
          ,("xmlns:dcmitype","http://purl.org/dc/dcmitype/")
          ,("xmlns:xsi","http://www.w3.org/2001/XMLSchema-instance")]
          $ mktnode "dc:title" [] (stringify $ docTitle meta)
          : mktnode "dc:creator" [] (T.intercalate "; " (map stringify $ docAuthors meta))
          : [ mktnode (M.findWithDefault "" k extraCorePropsMap) [] (lookupMetaString' k meta)
            | k <- M.keys (unMeta meta), k `elem` extraCoreProps]
          ++ mknode "cp:keywords" [] (T.unpack $ T.intercalate ", " keywords)
          : (\x -> [ mknode "dcterms:created" [("xsi:type","dcterms:W3CDTF")] x
                   , mknode "dcterms:modified" [("xsi:type","dcterms:W3CDTF")] x
                   ]) (formatTime defaultTimeLocale "%FT%XZ" utctime)
  let docPropsEntry = toEntry docPropsPath epochtime $ renderXml docProps

  -- docProps/custom.xml
  let customProperties :: [(String, String)]
      customProperties = [(T.unpack k, T.unpack $ lookupMetaString k meta) | k <- M.keys (unMeta meta)
                         , k `notElem` (["title", "author", "keywords"]
                                       ++ extraCoreProps)]
  let mkCustomProp (k, v) pid = mknode "property"
         [("fmtid","{D5CDD505-2E9C-101B-9397-08002B2CF9AE}")
         ,("pid", show pid)
         ,("name", k)] $ mknode "vt:lpwstr" [] v
  let customPropsPath = "docProps/custom.xml"
  let customProps = mknode "Properties"
          [("xmlns","http://schemas.openxmlformats.org/officeDocument/2006/custom-properties")
          ,("xmlns:vt","http://schemas.openxmlformats.org/officeDocument/2006/docPropsVTypes")
          ] $ zipWith mkCustomProp customProperties [(2 :: Int)..]
  let customPropsEntry = toEntry customPropsPath epochtime $ renderXml customProps

  let relsPath = "_rels/.rels"
  let rels = mknode "Relationships" [("xmlns", "http://schemas.openxmlformats.org/package/2006/relationships")]
        $ map (\attrs -> mknode "Relationship" attrs ())
        [ [("Id","rId1")
          ,("Type","http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument")
          ,("Target","word/document.xml")]
        , [("Id","rId4")
          ,("Type","http://schemas.openxmlformats.org/officeDocument/2006/relationships/extended-properties")
          ,("Target","docProps/app.xml")]
        , [("Id","rId3")
          ,("Type","http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties")
          ,("Target","docProps/core.xml")]
        , [("Id","rId5")
          ,("Type","http://schemas.openxmlformats.org/officeDocument/2006/relationships/custom-properties")
          ,("Target","docProps/custom.xml")]
        ]
  let relsEntry = toEntry relsPath epochtime $ renderXml rels

  -- we use dist archive for settings.xml, because Word sometimes
  -- adds references to footnotes or endnotes we don't have...
  -- we do, however, copy some settings over from reference
  let settingsPath = "word/settings.xml"
      settingsList = [ "w:autoHyphenation"
                     , "w:consecutiveHyphenLimit"
                     , "w:hyphenationZone"
                     , "w:doNotHyphenateCap"
                     , "w:evenAndOddHeaders"
                     , "w:proofState"
                     ]
  settingsEntry <- copyChildren refArchive distArchive settingsPath epochtime settingsList

  let entryFromArchive arch path =
         maybe (throwError $ PandocSomeError
                           $ T.pack $ path ++ " missing in reference docx")
               return
               (findEntryByPath path arch `mplus` findEntryByPath path distArchive)
  docPropsAppEntry <- entryFromArchive refArchive "docProps/app.xml"
  themeEntry <- entryFromArchive refArchive "word/theme/theme1.xml"
  fontTableEntry <- entryFromArchive refArchive "word/fontTable.xml"
  webSettingsEntry <- entryFromArchive refArchive "word/webSettings.xml"
  headerFooterEntries <- mapM (entryFromArchive refArchive . ("word/" ++)) $
                     mapMaybe extractTarget (headers ++ footers)
  let miscRelEntries = [ e | e <- zEntries refArchive
                       , "word/_rels/" `isPrefixOf` eRelativePath e
                       , ".xml.rels" `isSuffixOf` eRelativePath e
                       , eRelativePath e /= "word/_rels/document.xml.rels"
                       , eRelativePath e /= "word/_rels/footnotes.xml.rels" ]
  let otherMediaEntries = [ e | e <- zEntries refArchive
                          , "word/media/" `isPrefixOf` eRelativePath e ]

  -- Create archive
  let archive = foldr addEntryToArchive emptyArchive $
                  contentTypesEntry : relsEntry : contentEntry : relEntry :
                  footnoteRelEntry : numEntry : styleEntry : footnotesEntry :
                  commentsEntry :
                  docPropsEntry : docPropsAppEntry : customPropsEntry :
                  themeEntry :
                  fontTableEntry : settingsEntry : webSettingsEntry :
                  imageEntries ++ headerFooterEntries ++
                  miscRelEntries ++ otherMediaEntries
  return $ fromArchive archive

newParaPropToOpenXml :: ParaStyleName -> Element
newParaPropToOpenXml (fromStyleName -> s) =
  let styleId = T.filter (not . isSpace) s
  in mknode "w:style" [ ("w:type", "paragraph")
                      , ("w:customStyle", "1")
                      , ("w:styleId", T.unpack styleId)]
     [ mknode "w:name" [("w:val", T.unpack s)] ()
     , mknode "w:basedOn" [("w:val","BodyText")] ()
     , mknode "w:qFormat" [] ()
     ]

newTextPropToOpenXml :: CharStyleName -> Element
newTextPropToOpenXml (fromStyleName -> s) =
  let styleId = T.filter (not . isSpace) s
  in mknode "w:style" [ ("w:type", "character")
                      , ("w:customStyle", "1")
                      , ("w:styleId", T.unpack styleId)]
     [ mknode "w:name" [("w:val", T.unpack s)] ()
     , mknode "w:basedOn" [("w:val","BodyTextChar")] ()
     ]

styleToOpenXml :: StyleMaps -> Style -> [Element]
styleToOpenXml sm style =
  maybeToList parStyle ++ mapMaybe toStyle alltoktypes
  where alltoktypes = enumFromTo KeywordTok NormalTok
        toStyle toktype | hasStyleName (fromString $ show toktype) (smCharStyle sm) = Nothing
                        | otherwise = Just $
                          mknode "w:style" [("w:type","character"),
                           ("w:customStyle","1"),("w:styleId",show toktype)]
                             [ mknode "w:name" [("w:val",show toktype)] ()
                             , mknode "w:basedOn" [("w:val","VerbatimChar")] ()
                             , mknode "w:rPr" [] $
                               [ mknode "w:color" [("w:val",tokCol toktype)] ()
                                 | tokCol toktype /= "auto" ] ++
                               [ mknode "w:shd" [("w:val","clear"),("w:fill",tokBg toktype)] ()
                                 | tokBg toktype /= "auto" ] ++
                               [ mknode "w:b" [] () | tokFeature tokenBold toktype ] ++
                               [ mknode "w:i" [] () | tokFeature tokenItalic toktype ] ++
                               [ mknode "w:u" [] () | tokFeature tokenUnderline toktype ]
                             ]
        tokStyles = tokenStyles style
        tokFeature f toktype = maybe False f $ M.lookup toktype tokStyles
        tokCol toktype = maybe "auto" (drop 1 . fromColor)
                         $ (tokenColor =<< M.lookup toktype tokStyles)
                           `mplus` defaultColor style
        tokBg toktype = maybe "auto" (drop 1 . fromColor)
                         $ (tokenBackground =<< M.lookup toktype tokStyles)
                           `mplus` backgroundColor style
        parStyle | hasStyleName "Source Code" (smParaStyle sm) = Nothing
                 | otherwise = Just $
                   mknode "w:style" [("w:type","paragraph"),
                           ("w:customStyle","1"),("w:styleId","SourceCode")]
                             [ mknode "w:name" [("w:val","Source Code")] ()
                             , mknode "w:basedOn" [("w:val","Normal")] ()
                             , mknode "w:link" [("w:val","VerbatimChar")] ()
                             , mknode "w:pPr" []
                               $ mknode "w:wordWrap" [("w:val","off")] ()
                               :
                         maybe [] (\col -> [mknode "w:shd" [("w:val","clear"),("w:fill",drop 1 $ fromColor col)] ()]) (backgroundColor style)
                             ]

copyChildren :: (PandocMonad m) => Archive -> Archive -> String -> Integer -> [String] -> m Entry
copyChildren refArchive distArchive path timestamp elNames = do
  ref  <- parseXml refArchive distArchive path
  dist <- parseXml distArchive distArchive path
  return $ toEntry path timestamp $ renderXml dist{
      elContent = elContent dist ++ copyContent ref
    }
  where
    strName QName{qName=name, qPrefix=prefix}
      | Just p <- prefix = p++":"++name
      | otherwise        = name
    shouldCopy = (`elem` elNames) . strName
    cleanElem el@Element{elName=name} = Elem el{elName=name{qURI=Nothing}}
    copyContent = map cleanElem . filterChildrenName shouldCopy

-- this is the lowest number used for a list numId
baseListId :: Int
baseListId = 1000

mkNumbering :: [ListMarker] -> [Element]
mkNumbering lists =
  elts ++ zipWith mkNum lists [baseListId..(baseListId + length lists - 1)]
    where elts = zipWith mkAbstractNum (ordNub lists) $
                     randomRs (0x10000000, 0xFFFFFFFF) $ mkStdGen 1848

maxListLevel :: Int
maxListLevel = 8

mkNum :: ListMarker -> Int -> Element
mkNum marker numid =
  mknode "w:num" [("w:numId",show numid)]
   $ mknode "w:abstractNumId" [("w:val",listMarkerToId marker)] ()
   : case marker of
       NoMarker     -> []
       BulletMarker -> []
       NumberMarker _ _ start ->
          map (\lvl -> mknode "w:lvlOverride" [("w:ilvl",show (lvl :: Int))]
              $ mknode "w:startOverride" [("w:val",show start)] ())
                [0..maxListLevel]

mkAbstractNum :: ListMarker -> Integer -> Element
mkAbstractNum marker nsid =
  mknode "w:abstractNum" [("w:abstractNumId",listMarkerToId marker)]
    $ mknode "w:nsid" [("w:val", printf "%8x" nsid)] ()
    : mknode "w:multiLevelType" [("w:val","multilevel")] ()
    : map (mkLvl marker)
      [0..maxListLevel]

mkLvl :: ListMarker -> Int -> Element
mkLvl marker lvl =
  mknode "w:lvl" [("w:ilvl",show lvl)] $
    [ mknode "w:start" [("w:val",start)] ()
      | marker /= NoMarker && marker /= BulletMarker ] ++
    [ mknode "w:numFmt" [("w:val",fmt)] ()
    , mknode "w:lvlText" [("w:val",lvltxt)] ()
    , mknode "w:lvlJc" [("w:val","left")] ()
    , mknode "w:pPr" []
      [ mknode "w:tabs" []
        $ mknode "w:tab" [("w:val","num"),("w:pos",show $ lvl * step)] ()
      , mknode "w:ind" [("w:left",show $ lvl * step + hang),("w:hanging",show hang)] ()
      ]
    ]
    where (fmt, lvltxt, start) =
            case marker of
                 NoMarker             -> ("bullet"," ","1")
                 BulletMarker         -> ("bullet",bulletFor lvl,"1")
                 NumberMarker st de n -> (styleFor st lvl
                                         ,patternFor de ("%" ++ show (lvl + 1))
                                         ,show n)
          step = 720
          hang = 480
          bulletFor 0 = "\x2022"  -- filled circle
          bulletFor 1 = "\x2013"  -- en dash
          bulletFor 2 = "\x2022"  -- hyphen bullet
          bulletFor 3 = "\x2013"
          bulletFor 4 = "\x2022"
          bulletFor 5 = "\x2013"
          bulletFor x = bulletFor (x `mod` 6)
          styleFor UpperAlpha _   = "upperLetter"
          styleFor LowerAlpha _   = "lowerLetter"
          styleFor UpperRoman _   = "upperRoman"
          styleFor LowerRoman _   = "lowerRoman"
          styleFor Decimal _      = "decimal"
          styleFor DefaultStyle 0 = "decimal"
          styleFor DefaultStyle 1 = "lowerLetter"
          styleFor DefaultStyle 2 = "lowerRoman"
          styleFor DefaultStyle 3 = "decimal"
          styleFor DefaultStyle 4 = "lowerLetter"
          styleFor DefaultStyle 5 = "lowerRoman"
          styleFor DefaultStyle x = styleFor DefaultStyle (x `mod` 6)
          styleFor _ _            = "decimal"
          patternFor OneParen s  = s ++ ")"
          patternFor TwoParens s = "(" ++ s ++ ")"
          patternFor _ s         = s ++ "."

getNumId :: (PandocMonad m) => WS m Int
getNumId = (((baseListId - 1) +) . length) `fmap` gets stLists


makeTOC :: (PandocMonad m) => WriterOptions -> WS m [Element]
makeTOC opts = do
  let depth = "1-"++show (writerTOCDepth opts)
  let tocCmd = "TOC \\o \""++depth++"\" \\h \\z \\u"
  tocTitle <- gets stTocTitle
  title <- withParaPropM (pStyleM "TOC Heading") (blocksToOpenXML opts [Para tocTitle])
  return
    [mknode "w:sdt" [] [
      mknode "w:sdtPr" [] (
        mknode "w:docPartObj" []
          [mknode "w:docPartGallery" [("w:val","Table of Contents")] (),
          mknode "w:docPartUnique" [] ()]
         -- w:docPartObj
      ), -- w:sdtPr
      mknode "w:sdtContent" [] (title++[
        mknode "w:p" [] (
          mknode "w:r" [] [
            mknode "w:fldChar" [("w:fldCharType","begin"),("w:dirty","true")] (),
            mknode "w:instrText" [("xml:space","preserve")] tocCmd,
            mknode "w:fldChar" [("w:fldCharType","separate")] (),
            mknode "w:fldChar" [("w:fldCharType","end")] ()
          ] -- w:r
        ) -- w:p
      ])
    ]] -- w:sdt

-- | Convert Pandoc document to two lists of
-- OpenXML elements (the main document and footnotes).
writeOpenXML :: (PandocMonad m) => WriterOptions -> Pandoc -> WS m ([Element], [Element],[Element])
writeOpenXML opts (Pandoc meta blocks) = do
  let tit = docTitle meta
  let auths = docAuthors meta
  let dat = docDate meta
  let abstract' = lookupMetaBlocks "abstract" meta
  let subtitle' = lookupMetaInlines "subtitle" meta
  let includeTOC = writerTableOfContents opts || lookupMetaBool "toc" meta
  title <- withParaPropM (pStyleM "Title") $ blocksToOpenXML opts [Para tit | not (null tit)]
  subtitle <- withParaPropM (pStyleM "Subtitle") $ blocksToOpenXML opts [Para subtitle' | not (null subtitle')]
  authors <- withParaPropM (pStyleM "Author") $ blocksToOpenXML opts $
       map Para auths
  date <- withParaPropM (pStyleM "Date") $ blocksToOpenXML opts [Para dat | not (null dat)]
  abstract <- if null abstract'
                 then return []
                 else withParaPropM (pStyleM "Abstract") $ blocksToOpenXML opts abstract'
  let convertSpace (Str x : Space : Str y : xs) = Str (x <> " " <> y) : xs
      convertSpace (Str x : Str y : xs)         = Str (x <> y) : xs
      convertSpace xs                           = xs
  let blocks' = bottomUp convertSpace blocks
  doc' <- setFirstPara >> blocksToOpenXML opts blocks'
  notes' <- reverse <$> gets stFootnotes
  comments <- reverse <$> gets stComments
  let toComment (kvs, ils) = do
        annotation <- inlinesToOpenXML opts ils
        return $
          mknode "w:comment" [('w':':':T.unpack k,T.unpack v) | (k,v) <- kvs]
            [ mknode "w:p" [] $
              [ mknode "w:pPr" []
                [ mknode "w:pStyle" [("w:val", "CommentText")] () ]
              , mknode "w:r" []
                [ mknode "w:rPr" []
                  [ mknode "w:rStyle" [("w:val", "CommentReference")] ()
                  , mknode "w:annotationRef" [] ()
                  ]
                ]
              ] ++ annotation
            ]
  comments' <- mapM toComment comments
  toc <- if includeTOC
            then makeTOC opts
            else return []
  let meta' = title ++ subtitle ++ authors ++ date ++ abstract ++ toc
  return (meta' ++ doc', notes', comments')

-- | Convert a list of Pandoc blocks to OpenXML.
blocksToOpenXML :: (PandocMonad m) => WriterOptions -> [Block] -> WS m [Element]
blocksToOpenXML opts bls = concat `fmap` mapM (blockToOpenXML opts) bls

pStyleM :: (PandocMonad m) => ParaStyleName -> WS m XML.Element
pStyleM styleName = do
  pStyleMap <- gets (smParaStyle . stStyleMaps)
  let sty' = getStyleIdFromName styleName pStyleMap
  return $ mknode "w:pStyle" [("w:val", T.unpack $ fromStyleId sty')] ()

rStyleM :: (PandocMonad m) => CharStyleName -> WS m XML.Element
rStyleM styleName = do
  cStyleMap <- gets (smCharStyle . stStyleMaps)
  let sty' = getStyleIdFromName styleName cStyleMap
  return $ mknode "w:rStyle" [("w:val", T.unpack $ fromStyleId sty')] ()

getUniqueId :: (PandocMonad m) => WS m String
-- the + 20 is to ensure that there are no clashes with the rIds
-- already in word/document.xml.rel
getUniqueId = do
  n <- gets stCurId
  modify $ \st -> st{stCurId = n + 1}
  return $ show n

-- | Key for specifying user-defined docx styles.
dynamicStyleKey :: T.Text
dynamicStyleKey = "custom-style"

-- | Convert a Pandoc block element to OpenXML.
blockToOpenXML :: (PandocMonad m) => WriterOptions -> Block -> WS m [Element]
blockToOpenXML opts blk = withDirection $ blockToOpenXML' opts blk

blockToOpenXML' :: (PandocMonad m) => WriterOptions -> Block -> WS m [Element]
blockToOpenXML' _ Null = return []
blockToOpenXML' opts (Div (ident,_classes,kvs) bs) = do
  stylemod <- case lookup dynamicStyleKey kvs of
                   Just (fromString . T.unpack -> sty) -> do
                      modify $ \s ->
                        s{stDynamicParaProps = Set.insert sty
                             (stDynamicParaProps s)}
                      return $ withParaPropM (pStyleM sty)
                   _ -> return id
  dirmod <- case lookup "dir" kvs of
                 Just "rtl" -> return $ local (\env -> env { envRTL = True })
                 Just "ltr" -> return $ local (\env -> env { envRTL = False })
                 _ -> return id
  let (hs, bs') = if ident == "refs"
                     then span isHeaderBlock bs
                     else ([], bs)
  let bibmod = if ident == "refs"
                  then withParaPropM (pStyleM "Bibliography")
                  else id
  header <- dirmod $ stylemod $ blocksToOpenXML opts hs
  contents <- dirmod $ bibmod $ stylemod $ blocksToOpenXML opts bs'
  wrapBookmark ident $ header <> contents
blockToOpenXML' opts (Header lev (ident,_,_) lst) = do
  setFirstPara
  paraProps <- withParaPropM (pStyleM (fromString $ "Heading "++show lev)) $
                    getParaProps False
  contents <- inlinesToOpenXML opts lst
  if T.null ident
     then return [mknode "w:p" [] (paraProps ++ contents)]
     else do
       let bookmarkName = ident
       modify $ \s -> s{ stSectionIds = Set.insert bookmarkName
                                      $ stSectionIds s }
       bookmarkedContents <- wrapBookmark bookmarkName contents
       return [mknode "w:p" [] (paraProps ++ bookmarkedContents)]
blockToOpenXML' opts (Plain lst) = do
  isInTable <- gets stInTable
  isInList <- gets stInList
  let block = blockToOpenXML opts (Para lst)
  prop <- pStyleM "Compact"
  if isInTable || isInList
     then withParaProp prop block
     else block
-- title beginning with fig: indicates that the image is a figure
blockToOpenXML' opts (Para [Image attr alt (src,T.stripPrefix "fig:" -> Just tit)]) = do
  setFirstPara
  prop <- pStyleM $
        if null alt
        then "Figure"
        else "Captioned Figure"
  paraProps <- local (\env -> env { envParaProperties = EnvProps (Just prop) [] <> envParaProperties env }) (getParaProps False)
  contents <- inlinesToOpenXML opts [Image attr alt (src,tit)]
  captionNode <- withParaPropM (pStyleM "Image Caption")
                 $ blockToOpenXML opts (Para alt)
  return $ mknode "w:p" [] (paraProps ++ contents) : captionNode
blockToOpenXML' opts (Para lst)
  | null lst && not (isEnabled Ext_empty_paragraphs opts) = return []
  | otherwise = do
      isFirstPara <- gets stFirstPara
      let displayMathPara = case lst of
                                 [x] -> isDisplayMath x
                                 _   -> False
      paraProps <- getParaProps displayMathPara
      bodyTextStyle <- pStyleM $ if isFirstPara
                       then "First Paragraph"
                       else "Body Text"
      let paraProps' = case paraProps of
            []               -> [mknode "w:pPr" [] [bodyTextStyle]]
            ps               -> ps
      modify $ \s -> s { stFirstPara = False }
      contents <- inlinesToOpenXML opts lst
      return [mknode "w:p" [] (paraProps' ++ contents)]
blockToOpenXML' opts (LineBlock lns) = blockToOpenXML opts $ linesToPara lns
blockToOpenXML' _ b@(RawBlock format str)
  | format == Format "openxml" = return [ x | Elem x <- parseXML str ]
  | otherwise                  = do
      report $ BlockNotRendered b
      return []
blockToOpenXML' opts (BlockQuote blocks) = do
  p <- withParaPropM (pStyleM "Block Text")
       $ blocksToOpenXML opts blocks
  setFirstPara
  return p
blockToOpenXML' opts (CodeBlock attrs@(ident, _, _) str) = do
  p <- withParaPropM (pStyleM "Source Code") (blockToOpenXML opts $ Para [Code attrs str])
  setFirstPara
  wrapBookmark ident p
blockToOpenXML' _ HorizontalRule = do
  setFirstPara
  return [
    mknode "w:p" [] $ mknode "w:r" [] $ mknode "w:pict" []
    $ mknode "v:rect" [("style","width:0;height:1.5pt"),
                       ("o:hralign","center"),
                       ("o:hrstd","t"),("o:hr","t")] () ]
blockToOpenXML' opts (Table _ blkCapt specs thead tbody tfoot) = do
  let (caption, aligns, widths, headers, rows) = toLegacyTable blkCapt specs thead tbody tfoot
  setFirstPara
  modify $ \s -> s { stInTable = True }
  let captionStr = stringify caption
  caption' <- if null caption
                 then return []
                 else withParaPropM (pStyleM "Table Caption")
                      $ blockToOpenXML opts (Para caption)
  let alignmentFor al = mknode "w:jc" [("w:val",alignmentToString al)] ()
  -- Table cells require a <w:p> element, even an empty one!
  -- Not in the spec but in Word 2007, 2010. See #4953.
  let cellToOpenXML (al, cell) = do
        es <- withParaProp (alignmentFor al) $ blocksToOpenXML opts cell
        return $ if any (\e -> qName (elName e) == "p") es
           then es
           else es ++ [mknode "w:p" [] ()]
  headers' <- mapM cellToOpenXML $ zip aligns headers
  rows' <- mapM (mapM cellToOpenXML . zip aligns) rows
  let borderProps = mknode "w:tcPr" []
                    [ mknode "w:tcBorders" []
                      $ mknode "w:bottom" [("w:val","single")] ()
                    , mknode "w:vAlign" [("w:val","bottom")] () ]
  compactStyle <- pStyleM "Compact"
  let emptyCell' = [mknode "w:p" [] [mknode "w:pPr" [] [compactStyle]]]
  let mkcell border contents = mknode "w:tc" []
                            $ [ borderProps | border ] ++
                            if null contents
                               then emptyCell'
                               else contents
  let mkrow border cells = mknode "w:tr" [] $
                        [mknode "w:trPr" [] [
                          mknode "w:cnfStyle" [("w:firstRow","1")] ()] | border]
                        ++ map (mkcell border) cells
  let textwidth = 7920  -- 5.5 in in twips, 1/20 pt
  let fullrow = 5000 -- 100% specified in pct
  let rowwidth = fullrow * sum widths
  let mkgridcol w = mknode "w:gridCol"
                       [("w:w", show (floor (textwidth * w) :: Integer))] ()
  let hasHeader = any (not . null) headers
  modify $ \s -> s { stInTable = False }
  return $
    caption' ++
    [mknode "w:tbl" []
      ( mknode "w:tblPr" []
        (   mknode "w:tblStyle" [("w:val","Table")] () :
            mknode "w:tblW" [("w:type", "pct"), ("w:w", show rowwidth)] () :
            mknode "w:tblLook" [("w:firstRow",if hasHeader then "1" else "0") ] () :
          [ mknode "w:tblCaption" [("w:val", T.unpack captionStr)] ()
          | not (null caption) ] )
      : mknode "w:tblGrid" []
        (if all (==0) widths
            then []
            else map mkgridcol widths)
      : [ mkrow True headers' | hasHeader ] ++
      map (mkrow False) rows'
      )]
blockToOpenXML' opts el
  | BulletList lst <- el = addOpenXMLList BulletMarker lst
  | OrderedList (start, numstyle, numdelim) lst <- el
  = addOpenXMLList (NumberMarker numstyle numdelim start) lst
  where
    addOpenXMLList marker lst = do
      addList marker
      numid  <- getNumId
      l <- asList $ concat `fmap` mapM (listItemToOpenXML opts numid) lst
      setFirstPara
      return l
blockToOpenXML' opts (DefinitionList items) = do
  l <- concat `fmap` mapM (definitionListItemToOpenXML opts) items
  setFirstPara
  return l

definitionListItemToOpenXML  :: (PandocMonad m) => WriterOptions -> ([Inline],[[Block]]) -> WS m [Element]
definitionListItemToOpenXML opts (term,defs) = do
  term' <- withParaPropM (pStyleM "Definition Term")
           $ blockToOpenXML opts (Para term)
  defs' <- withParaPropM (pStyleM "Definition")
           $ concat `fmap` mapM (blocksToOpenXML opts) defs
  return $ term' ++ defs'

addList :: (PandocMonad m) => ListMarker -> WS m ()
addList marker = do
  lists <- gets stLists
  modify $ \st -> st{ stLists = lists ++ [marker] }

listItemToOpenXML :: (PandocMonad m) => WriterOptions -> Int -> [Block] -> WS m [Element]
listItemToOpenXML _ _ []                   = return []
listItemToOpenXML opts numid (first:rest) = do
  oldInList <- gets stInList
  modify $ \st -> st{ stInList = True }
  first' <- withNumId numid $ blockToOpenXML opts first
  -- baseListId is the code for no list marker:
  rest'  <- withNumId baseListId $ blocksToOpenXML opts rest
  modify $ \st -> st{ stInList = oldInList }
  return $ first' ++ rest'

alignmentToString :: Alignment -> [Char]
alignmentToString alignment = case alignment of
                                 AlignLeft    -> "left"
                                 AlignRight   -> "right"
                                 AlignCenter  -> "center"
                                 AlignDefault -> "left"

-- | Convert a list of inline elements to OpenXML.
inlinesToOpenXML :: (PandocMonad m) => WriterOptions -> [Inline] -> WS m [Element]
inlinesToOpenXML opts lst = concat `fmap` mapM (inlineToOpenXML opts) lst

withNumId :: (PandocMonad m) => Int -> WS m a -> WS m a
withNumId numid = local $ \env -> env{ envListNumId = numid }

asList :: (PandocMonad m) => WS m a -> WS m a
asList = local $ \env -> env{ envListLevel = envListLevel env + 1 }

isStyle :: Element -> Bool
isStyle e = isElem [] "w" "rStyle" e ||
            isElem [] "w" "pStyle" e

getTextProps :: (PandocMonad m) => WS m [Element]
getTextProps = do
  props <- asks envTextProperties
  let squashed = squashProps props
  return [mknode "w:rPr" [] squashed | (not . null) squashed]

withTextProp :: PandocMonad m => Element -> WS m a -> WS m a
withTextProp d p =
  local (\env -> env {envTextProperties = ep <> envTextProperties env}) p
  where ep = if isStyle d then EnvProps (Just d) [] else EnvProps Nothing [d]

withTextPropM :: PandocMonad m => WS m Element -> WS m a -> WS m a
withTextPropM md p = do
  d <- md
  withTextProp d p

getParaProps :: PandocMonad m => Bool -> WS m [Element]
getParaProps displayMathPara = do
  props <- asks envParaProperties
  listLevel <- asks envListLevel
  numid <- asks envListNumId
  let listPr = [mknode "w:numPr" []
                [ mknode "w:ilvl" [("w:val",show listLevel)] ()
                , mknode "w:numId" [("w:val",show numid)] () ] | listLevel >= 0 && not displayMathPara]
  return $ case listPr ++ squashProps props of
                [] -> []
                ps -> [mknode "w:pPr" [] ps]

withParaProp :: PandocMonad m => Element -> WS m a -> WS m a
withParaProp d p =
  local (\env -> env {envParaProperties = ep <> envParaProperties env}) p
  where ep = if isStyle d then EnvProps (Just d) [] else EnvProps Nothing [d]

withParaPropM :: PandocMonad m => WS m Element -> WS m a -> WS m a
withParaPropM md p = do
  d <- md
  withParaProp d p

formattedString :: PandocMonad m => T.Text -> WS m [Element]
formattedString str =
  -- properly handle soft hyphens
  case splitTextBy (=='\173') str of
      [w] -> formattedString' w
      ws  -> do
         sh <- formattedRun [mknode "w:softHyphen" [] ()]
         intercalate sh <$> mapM formattedString' ws

formattedString' :: PandocMonad m => T.Text -> WS m [Element]
formattedString' str = do
  inDel <- asks envInDel
  formattedRun [ mktnode (if inDel then "w:delText" else "w:t")
                 [("xml:space","preserve")] (stripInvalidChars str) ]

formattedRun :: PandocMonad m => [Element] -> WS m [Element]
formattedRun els = do
  props <- getTextProps
  return [ mknode "w:r" [] $ props ++ els ]

setFirstPara :: PandocMonad m => WS m ()
setFirstPara =  modify $ \s -> s { stFirstPara = True }

-- | Convert an inline element to OpenXML.
inlineToOpenXML :: PandocMonad m => WriterOptions -> Inline -> WS m [Element]
inlineToOpenXML opts il = withDirection $ inlineToOpenXML' opts il

inlineToOpenXML' :: PandocMonad m => WriterOptions -> Inline -> WS m [Element]
inlineToOpenXML' _ (Str str) =
  formattedString str
inlineToOpenXML' opts Space = inlineToOpenXML opts (Str " ")
inlineToOpenXML' opts SoftBreak = inlineToOpenXML opts (Str " ")
inlineToOpenXML' opts (Span (_,["underline"],_) ils) =
  withTextProp (mknode "w:u" [("w:val","single")] ()) $
    inlinesToOpenXML opts ils
inlineToOpenXML' _ (Span (ident,["comment-start"],kvs) ils) = do
  -- prefer the "id" in kvs, since that is the one produced by the docx
  -- reader.
  let ident' = fromMaybe ident (lookup "id" kvs)
      kvs' = filter (("id" /=) . fst) kvs
  modify $ \st -> st{ stComments = (("id",ident'):kvs', ils) : stComments st }
  return [ mknode "w:commentRangeStart" [("w:id", T.unpack ident')] () ]
inlineToOpenXML' _ (Span (ident,["comment-end"],kvs) _) =
  -- prefer the "id" in kvs, since that is the one produced by the docx
  -- reader.
  let ident' = fromMaybe ident (lookup "id" kvs)
  in
    return [ mknode "w:commentRangeEnd" [("w:id", T.unpack ident')] ()
           , mknode "w:r" []
             [ mknode "w:rPr" []
               [ mknode "w:rStyle" [("w:val", "CommentReference")] () ]
             , mknode "w:commentReference" [("w:id", T.unpack ident')] () ]
           ]
inlineToOpenXML' opts (Span (ident,classes,kvs) ils) = do
  stylemod <- case lookup dynamicStyleKey kvs of
                   Just (fromString . T.unpack -> sty) -> do
                      modify $ \s ->
                        s{stDynamicTextProps = Set.insert sty
                              (stDynamicTextProps s)}
                      return $ withTextPropM (rStyleM sty)
                   _ -> return id
  let dirmod = case lookup "dir" kvs of
                 Just "rtl" -> local (\env -> env { envRTL = True })
                 Just "ltr" -> local (\env -> env { envRTL = False })
                 _          -> id
      off x = withTextProp (mknode x [("w:val","0")] ())
      pmod =  (if "csl-no-emph" `elem` classes then off "w:i" else id) .
              (if "csl-no-strong" `elem` classes then off "w:b" else id) .
              (if "csl-no-smallcaps" `elem` classes
                  then off "w:smallCaps"
                  else id)
      getChangeAuthorDate = do
        defaultAuthor <- asks envChangesAuthor
        defaultDate <- asks envChangesDate
        let author = fromMaybe defaultAuthor (lookup "author" kvs)
            date   = fromMaybe defaultDate (lookup "date" kvs)
        return (author, date)
  insmod <- if "insertion" `elem` classes
               then do
                 (author, date) <- getChangeAuthorDate
                 insId <- gets stInsId
                 modify $ \s -> s{stInsId = insId + 1}
                 return $ \f -> do
                   x <- f
                   return [ mknode "w:ins"
                              [("w:id", show insId),
                              ("w:author", T.unpack author),
                              ("w:date", T.unpack date)] x ]
               else return id
  delmod <- if "deletion" `elem` classes
               then do
                 (author, date) <- getChangeAuthorDate
                 delId <- gets stDelId
                 modify $ \s -> s{stDelId = delId + 1}
                 return $ \f -> local (\env->env{envInDel=True}) $ do
                   x <- f
                   return [mknode "w:del"
                           [("w:id", show delId),
                           ("w:author", T.unpack author),
                           ("w:date", T.unpack date)] x]
               else return id
  contents <- insmod $ delmod $ dirmod $ stylemod $ pmod
                     $ inlinesToOpenXML opts ils
  wrapBookmark ident contents
inlineToOpenXML' opts (Strong lst) =
  withTextProp (mknode "w:b" [] ()) $ inlinesToOpenXML opts lst
inlineToOpenXML' opts (Emph lst) =
  withTextProp (mknode "w:i" [] ()) $ inlinesToOpenXML opts lst
inlineToOpenXML' opts (Subscript lst) =
  withTextProp (mknode "w:vertAlign" [("w:val","subscript")] ())
  $ inlinesToOpenXML opts lst
inlineToOpenXML' opts (Superscript lst) =
  withTextProp (mknode "w:vertAlign" [("w:val","superscript")] ())
  $ inlinesToOpenXML opts lst
inlineToOpenXML' opts (SmallCaps lst) =
  withTextProp (mknode "w:smallCaps" [] ())
  $ inlinesToOpenXML opts lst
inlineToOpenXML' opts (Strikeout lst) =
  withTextProp (mknode "w:strike" [] ())
  $ inlinesToOpenXML opts lst
inlineToOpenXML' _ LineBreak = return [br]
inlineToOpenXML' _ il@(RawInline f str)
  | f == Format "openxml" = return [ x | Elem x <- parseXML str ]
  | otherwise             = do
      report $ InlineNotRendered il
      return []
inlineToOpenXML' opts (Quoted quoteType lst) =
  inlinesToOpenXML opts $ [Str open] ++ lst ++ [Str close]
    where (open, close) = case quoteType of
                            SingleQuote -> ("\x2018", "\x2019")
                            DoubleQuote -> ("\x201C", "\x201D")
inlineToOpenXML' opts (Math mathType str) = do
  when (mathType == DisplayMath) setFirstPara
  res <- (lift . lift) (convertMath writeOMML mathType str)
  case res of
       Right r -> return [r]
       Left il -> inlineToOpenXML' opts il
inlineToOpenXML' opts (Cite _ lst) = inlinesToOpenXML opts lst
inlineToOpenXML' opts (Code attrs str) = do
  let alltoktypes = [KeywordTok ..]
  tokTypesMap <- mapM (\tt -> (,) tt <$> rStyleM (fromString $ show tt)) alltoktypes
  let unhighlighted = intercalate [br] `fmap`
                       mapM formattedString (T.lines str)
      formatOpenXML _fmtOpts = intercalate [br] . map (map toHlTok)
      toHlTok (toktype,tok) =
        mknode "w:r" []
          [ mknode "w:rPr" [] $
            maybeToList (lookup toktype tokTypesMap)
            , mknode "w:t" [("xml:space","preserve")] (T.unpack tok) ]
  withTextPropM (rStyleM "Verbatim Char")
    $ if isNothing (writerHighlightStyle opts)
          then unhighlighted
          else case highlight (writerSyntaxMap opts)
                      formatOpenXML attrs str of
                    Right h  -> return h
                    Left msg -> do
                      unless (T.null msg) $ report $ CouldNotHighlight msg
                      unhighlighted
inlineToOpenXML' opts (Note bs) = do
  notes <- gets stFootnotes
  notenum <- getUniqueId
  footnoteStyle <- rStyleM "Footnote Reference"
  let notemarker = mknode "w:r" []
                   [ mknode "w:rPr" [] footnoteStyle
                   , mknode "w:footnoteRef" [] () ]
  let notemarkerXml = RawInline (Format "openxml") $ T.pack $ ppElement notemarker
  let insertNoteRef (Plain ils : xs) = Plain (notemarkerXml : Space : ils) : xs
      insertNoteRef (Para ils  : xs) = Para  (notemarkerXml : Space : ils) : xs
      insertNoteRef xs               = Para [notemarkerXml] : xs

  contents <- local (\env -> env{ envListLevel = -1
                                , envParaProperties = mempty
                                , envTextProperties = mempty })
              (withParaPropM (pStyleM "Footnote Text") $ blocksToOpenXML opts
                $ insertNoteRef bs)
  let newnote = mknode "w:footnote" [("w:id", notenum)] contents
  modify $ \s -> s{ stFootnotes = newnote : notes }
  return [ mknode "w:r" []
           [ mknode "w:rPr" [] footnoteStyle
           , mknode "w:footnoteReference" [("w:id", notenum)] () ] ]
-- internal link:
inlineToOpenXML' opts (Link _ txt (T.uncons -> Just ('#', xs),_)) = do
  contents <- withTextPropM (rStyleM "Hyperlink") $ inlinesToOpenXML opts txt
  return
    [ mknode "w:hyperlink" [("w:anchor", T.unpack $ toBookmarkName xs)] contents ]
-- external link:
inlineToOpenXML' opts (Link _ txt (src,_)) = do
  contents <- withTextPropM (rStyleM "Hyperlink") $ inlinesToOpenXML opts txt
  extlinks <- gets stExternalLinks
  id' <- case M.lookup (T.unpack src) extlinks of
            Just i   -> return i
            Nothing  -> do
              i <- ("rId"++) `fmap` getUniqueId
              modify $ \st -> st{ stExternalLinks =
                        M.insert (T.unpack src) i extlinks }
              return i
  return [ mknode "w:hyperlink" [("r:id",id')] contents ]
inlineToOpenXML' opts (Image attr@(imgident, _, _) alt (src, title)) = do
  pageWidth <- asks envPrintWidth
  imgs <- gets stImages
  let
    stImage = M.lookup (T.unpack src) imgs
    generateImgElt (ident, _, _, img) =
      let
        (xpt,ypt) = desiredSizeInPoints opts attr
               (either (const def) id (imageSize opts img))
        -- 12700 emu = 1 pt
        (xemu,yemu) = fitToPage (xpt * 12700, ypt * 12700)
                                (pageWidth * 12700)
        cNvPicPr = mknode "pic:cNvPicPr" [] $
                         mknode "a:picLocks" [("noChangeArrowheads","1")
                                             ,("noChangeAspect","1")] ()
        nvPicPr  = mknode "pic:nvPicPr" []
                        [ mknode "pic:cNvPr"
                            [("descr",T.unpack src),("id","0"),("name","Picture")] ()
                        , cNvPicPr ]
        blipFill = mknode "pic:blipFill" []
          [ mknode "a:blip" [("r:embed",ident)] ()
          , mknode "a:stretch" [] $
              mknode "a:fillRect" [] ()
          ]
        xfrm =    mknode "a:xfrm" []
                        [ mknode "a:off" [("x","0"),("y","0")] ()
                        , mknode "a:ext" [("cx",show xemu)
                                         ,("cy",show yemu)] () ]
        prstGeom = mknode "a:prstGeom" [("prst","rect")] $
                         mknode "a:avLst" [] ()
        ln =      mknode "a:ln" [("w","9525")]
                        [ mknode "a:noFill" [] ()
                        , mknode "a:headEnd" [] ()
                        , mknode "a:tailEnd" [] () ]
        spPr =    mknode "pic:spPr" [("bwMode","auto")]
                        [xfrm, prstGeom, mknode "a:noFill" [] (), ln]
        graphic = mknode "a:graphic" [] $
          mknode "a:graphicData"
            [("uri","http://schemas.openxmlformats.org/drawingml/2006/picture")]
            [ mknode "pic:pic" []
              [ nvPicPr
              , blipFill
              , spPr
              ]
            ]
        imgElt = mknode "w:r" [] $
          mknode "w:drawing" [] $
            mknode "wp:inline" []
              [ mknode "wp:extent" [("cx",show xemu),("cy",show yemu)] ()
              , mknode "wp:effectExtent"
                [("b","0"),("l","0"),("r","0"),("t","0")] ()
              , mknode "wp:docPr"
                [ ("descr", T.unpack $ stringify alt)
                , ("title", T.unpack title)
                , ("id","1")
                , ("name","Picture")
                ] ()
              , graphic
              ]
      in
        imgElt

  wrapBookmark imgident =<< case stImage of
    Just imgData -> return [generateImgElt imgData]
    Nothing -> ( do --try
      (img, mt) <- P.fetchItem src
      ident <- ("rId"++) `fmap` getUniqueId

      let
        imgext = case mt >>= extensionFromMimeType of
          Just x    -> "." <> x
          Nothing   -> case imageType img of
            Just Png  -> ".png"
            Just Jpeg -> ".jpeg"
            Just Gif  -> ".gif"
            Just Pdf  -> ".pdf"
            Just Eps  -> ".eps"
            Just Svg  -> ".svg"
            Just Emf  -> ".emf"
            Nothing   -> ""
        imgpath = "media/" <> ident <> T.unpack imgext
        mbMimeType = mt <|> getMimeType imgpath

        imgData = (ident, imgpath, mbMimeType, img)

      if T.null imgext
         then -- without an extension there is no rule for content type
           inlinesToOpenXML opts alt -- return alt to avoid corrupted docx
         else do
           -- insert mime type to use in constructing [Content_Types].xml
           modify $ \st -> st { stImages = M.insert (T.unpack src) imgData $ stImages st }
           return [generateImgElt imgData]
      )
      `catchError` ( \e -> do
        report $ CouldNotFetchResource src $ T.pack (show e)
        -- emit alt text
        inlinesToOpenXML opts alt
      )

br :: Element
br = mknode "w:r" [] [mknode "w:br" [] ()]

-- Word will insert these footnotes into the settings.xml file
-- (whether or not they're visible in the document). If they're in the
-- file, but not in the footnotes.xml file, it will produce
-- problems. So we want to make sure we insert them into our document.
defaultFootnotes :: [Element]
defaultFootnotes = [ mknode "w:footnote"
                     [("w:type", "separator"), ("w:id", "-1")]
                     [ mknode "w:p" []
                       [mknode "w:r" []
                        [ mknode "w:separator" [] ()]]]
                   , mknode "w:footnote"
                     [("w:type", "continuationSeparator"), ("w:id", "0")]
                     [ mknode "w:p" []
                       [ mknode "w:r" []
                         [ mknode "w:continuationSeparator" [] ()]]]]


withDirection :: PandocMonad m => WS m a -> WS m a
withDirection x = do
  isRTL <- asks envRTL
  paraProps <- asks envParaProperties
  textProps <- asks envTextProperties
  -- We want to clean all bidirection (bidi) and right-to-left (rtl)
  -- properties from the props first. This is because we don't want
  -- them to stack up.
  let paraProps' = filter (\e -> (qName . elName) e /= "bidi") (otherElements paraProps)
      textProps' = filter (\e -> (qName . elName) e /= "rtl") (otherElements textProps)
      paraStyle = styleElement paraProps
      textStyle = styleElement textProps
  if isRTL
    -- if we are going right-to-left, we (re?)add the properties.
    then flip local x $
         \env -> env { envParaProperties = EnvProps paraStyle $ mknode "w:bidi" [] () : paraProps'
                     , envTextProperties = EnvProps textStyle $ mknode "w:rtl" [] () : textProps'
                     }
    else flip local x $ \env -> env { envParaProperties = EnvProps paraStyle paraProps'
                                    , envTextProperties = EnvProps textStyle textProps'
                                    }

wrapBookmark :: (PandocMonad m) => T.Text -> [Element] -> WS m [Element]
wrapBookmark "" contents = return contents
wrapBookmark ident contents = do
  id' <- getUniqueId
  let bookmarkStart = mknode "w:bookmarkStart"
                       [("w:id", id')
                       ,("w:name", T.unpack $ toBookmarkName ident)] ()
      bookmarkEnd = mknode "w:bookmarkEnd" [("w:id", id')] ()
  return $ bookmarkStart : contents ++ [bookmarkEnd]

-- Word imposes a 40 character limit on bookmark names and requires
-- that they begin with a letter.  So we just use a hash of the
-- identifier when otherwise we'd have an illegal bookmark name.
toBookmarkName :: T.Text -> T.Text
toBookmarkName s
  | Just (c, _) <- T.uncons s
  , isLetter c
  , T.length s <= 40 = s
  | otherwise = T.pack $ 'X' : drop 1 (showDigest (sha1 (fromTextLazy $ TL.fromStrict s)))